Finding the Fourth Proportional to 2,634.72, 3,949.04 and 990.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,634.72 : 3,949.04 = 990.21 : x
2. Step 2: Convert to fraction form
   2,634.72/3,949.04 = 990.21/x
3. Step 3: Cross multiply
   2,634.72x = 3,949.04 × 990.21
4. Step 4: Simplify right side
   2,634.72x = 3,910,390.61
5. Step 5: Solve for x
   x = 3,910,390.61/2,634.72
6. Step 6: Final answer
   x = 1,484.18